ARCHIVED REPORTS_XR0002285 - Laserfiche WebLink

Home Browse Search

Harding Lawson Associates b. Carbon Reactors - Two (2) Sun-Ag Inc. Model 2000V vapor phase adsorbers. Maximum flow rate capacity Of 800 CFM. Each reactor will contain 21000 pounds of Virgin SA4x6CC Vapor Phase Activated Carbon. ~' 2. Operating Schedule Continuous - 24 hours/day, 7 days/week 46.. 3 . Maximum Daily Production Rates and Expected Yields Typical of vapor extraction systems, we estimate that initial vapor concentrations will be relatively high, but then decline rapidly to a steady low concentration level. Without actual pump data from the trench (has not been installed yet) we need to make some assumptions. Maximum expected flow rate of the blower manifolded to the trench, former tank laterals, and the t. soil pile is anticipated to be 200 CFM. The expected initial vap3r concentrations should be no higher than 20, 000 mg/M . After four days of operation, the vapor concentrations should be steady at approximately 1, 000 mg/M and will gradually decline to less than 400 mg/M3 during the first year of operation. Based on these assumptions, the calculated yield in pounds per day of the VES is : �. Daily Yield = mg/M3 x ft3/min x M3/35. 3 ft3 x 1, 440 min/day x lb/453 , 592 mg ti. First Day Yield = 20, 000 x 200 x 1,440 / 35. 3 x 453 ,592 360 lbs/day �. Fourth Day Yield = 1, 000 x 200 x 1,440 / 35. 3 x 453 , 592 = 18 lbs/day An average value of the first and fourth day is used to calculate second and third day yields as 189 lbs/day. Total estimated yield of VES during the first year with no decline in vapor concentrations from 1, 000 mg/M3 is approximately 7, 200 pounds of gasoline as vapor. This is a high value estimate. Actual values should be much lower as the vapor concentration are expected to decline throughout �he operation of the VES. If values decline to 400 mg/M after one year of operation, the 032909P/RS3